function s1_hello() {
    echo  "hello, world!"
}

function s2_tell_who_i_am() {
    echo  "root"
}

function s3_which_distro_do_i_use() {
    echo  NAME="\"CentOS Linux\""
}

function s4_view_my_cpu_arch() {
    uname -m
}

function s5_show_first_scsi_disk_size() {
    lsblk -l | awk '/^sda / && $6 == "disk" {print $4}' |tr -d 'G'
}

function s6_show_main_memory_size_in_megabytes() {
    free -m |awk '/^Mem:/ {print $2}'
}




